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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <asm/cpufeature.h>
#include <asm/processor.h>
#include "curve25519-x86_64.h"
static bool curve25519_use_bmi2 __ro_after_init;
static bool curve25519_use_adx __ro_after_init;
void __init curve25519_fpu_init(void)
{
curve25519_use_bmi2 = boot_cpu_has(X86_FEATURE_BMI2);
curve25519_use_adx = boot_cpu_has(X86_FEATURE_BMI2) &&
boot_cpu_has(X86_FEATURE_ADX);
}
static inline bool curve25519_arch(u8 mypublic[CURVE25519_POINT_SIZE],
const u8 secret[CURVE25519_POINT_SIZE],
const u8 basepoint[CURVE25519_POINT_SIZE])
{
if (curve25519_use_adx) {
curve25519_adx(mypublic, secret, basepoint);
return true;
} else if (curve25519_use_bmi2) {
curve25519_bmi2(mypublic, secret, basepoint);
return true;
}
return false;
}
static inline bool curve25519_base_arch(u8 pub[CURVE25519_POINT_SIZE],
const u8 secret[CURVE25519_POINT_SIZE])
{
if (curve25519_use_adx) {
curve25519_adx_base(pub, secret);
return true;
} else if (curve25519_use_bmi2) {
curve25519_bmi2_base(pub, secret);
return true;
}
return false;
}
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